"Wastewater" is the dirty water
that leaves your home. This dirty water is carried to places called
wastewater treatment facilities. The water travels from your bathroom to the
sewer mains, or pipes. Sewer mains are usually located about 1.8 meters (6
feet) or more in the ground, under a street or alley.
Wastewater flows through the sewer pipes by gravity, rather than pressure.
That means the pipes must be slanted so the sewage flows down.
City sewer main pipes usually connect into sewers called interceptor sewers.
Intercepter sewers then join to form a trunk line. This line
goes to the wastewater treatment plant.
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